Convert all category select checkboxes in to radio buttons in the WordPress post-edit screen.

gistfile1.js

// Convert all Category input checkboxes in to radio selects 
// It completely replaces the elements with new ones and transfers
// the attributes from the old element to the new.
// We can't just change the type because of, you guessed it, Internet Explorer
// Yes, sometimes a hand grenade is easier than a scalpel ;)
jQuery('form#post').find('.categorychecklist input').each(function() {
	var new_input = jQuery('<input type="radio" />'),
		attrLen = this.attributes.length;
				
	for (i = 0; i < attrLen; i++) {
		if (this.attributes[i].name != 'type') {
			new_input.attr(this.attributes[i].name.toLowerCase(), this.attributes[i].value);
		}
	}
			
	jQuery(this).replaceWith(new_input);
});

Hi Gipetto,

Thanks for providing this useful .js, but I'm struggling to work out where I'm meant to put the code to get it to work?

I'm using WP 3.5, any help would be greatly appreciated.

Regards,
Paul